Is it okay for a parent to read their child's journal/diary?

So when I was about twelve-years-old, my father went through my room. He loves to snoop, and he got ahold of my journal. I had very few friends, so I wrote all my thoughts/feelings in it. He read it while I was at school one day without letting me know that he was going to go through my things.

When I got home, he led me to my room and shut the door. He locked it. He sat down in a chair and picked up my journal and looked at me. He said, "Just to be clear, I had no idea what this was. I found it while looking through your room. I didn't read anything, I just looked through it and looked for the word dad."

At this time, my dad and I had started getting into fights regularly. About two weeks before this fiasco, he decided to take away something (I don't remember what it was, I think it was a tablet) because he didn't like me having it. He decided to give it to my sister (he also did this with two iPhones that I had paid for with my own money, he gave them to my two sisters). I was very upset about this incident, so I wrote about it in my journal. He saw that entry, and he became very upset, saying that his actions were indeed justified. When I asked how they were justified, he couldn't give me a clear answer. He just said things along the lines of, "You have no right to say that I'm childish" and "I don't care what kids your age think."

I asked my mother about what she thought about my father's behavior, and she thinks that he was very childish to do that, because why must he feel the need to look through his twelve-year-old daughter's diary? I don't know where I stand in this situation. It's been about three years, and I want to know what you ladies think.

As of now, my father and I don't talk, and my mother can't stand him. She can't divorce him because that would be seen as selfishness and adultery in our church. He's emotionally abusive to all of us, including her. He's narcissistic. My mom even went to our church pastor for help, but all he said was to pray about it. My father acts so nice around other people, that no one believes us when we say that he's actually a jerk.

Thoughts?

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